/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.connector.file.src.util;

import org.apache.flink.annotation.PublicEvolving;
import org.apache.flink.util.ExceptionUtils;
import org.apache.flink.util.IOUtils;
import org.apache.flink.util.function.SupplierWithException;
import org.apache.flink.util.function.ThrowingRunnable;

import java.io.Closeable;
import java.io.IOException;

/**
 * Miscellaneous utilities for the file source.
 */
@PublicEvolving
public final class Utils {

	/**
	 * Runs the given {@code SupplierWithException} (a piece of code producing a result).
	 * If an exception happens during that, the given closable is quietly closed.
	 */
	public static <E> E doWithCleanupOnException(
			final Closeable toCleanUp,
			final SupplierWithException<E, IOException> code) throws IOException {

		try {
			return code.get();
		}
		catch (Throwable t) {
			IOUtils.closeQuietly(toCleanUp);
			ExceptionUtils.rethrowIOException(t);
			return null; // silence the compiler
		}
	}

	/**
	 * Runs the given {@code Runnable}. If an exception happens during that, the given closable
	 * is quietly closed.
	 */
	public static void doWithCleanupOnException(
			final Closeable toCleanUp,
			final ThrowingRunnable<IOException> code) throws IOException {

		doWithCleanupOnException(toCleanUp, (SupplierWithException<Void, IOException>) () -> {
			code.run();
			return null;
		});
	}

	// ------------------------------------------------------------------------

	/** This class is not meant to be instantiated. */
	private Utils() {}
}
